Muggles from around the world flock to this iconic scene at the top of Loch Shiel in the West Highlands of Scotland to marvel at the 21-arched Glenfinnan Viaduct, also known as the "Harry Potter bridge." The curving structure was made famous in the film adaptations of J.K. Rowling"s novels as part of the route taken by the Hogwarts Express, which carries students to and from the wizarding boarding school at the start and end of every term. And today is a reason to celebrate for Potterheads, as we are marking the 20th anniversary of Harry Potter"s big-screen debut.